Each of two long straight parallel wires 14 cm apart carries a current of 125 A

Question

Each of two long straight parallel wires 14 cm apart carries a current of 125 A. The figure shows a cross section, with the wires running perpendicular to the page and point P lying on the perpendicular bisector of the line between the wires. Find the magnitude and direction of the magnetic field at P when the current in the left-hand wire is out of the page and the current in the right-hand wire is also out of the page. (a) What is the magnitude of B? (b) Find the magnitude and direction of the magnetic field at P when the current in the left-hand wire is out of the page and the current in the right-hand wire is into the page. What is the magnitude of B? (c) What is the value of Bz?

Explanation / Answer

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